Hootsuite, a social-media management tool, has a mascot named Owly.
Hootsuite…

The Twitter bird is ubiquitous.
Twitter…

Alibaba, the Chinese e-commerce giant, uses a cat as the logo for its Tmall subsidiary in the shape of the Chinese character for "sky" and the English letter "T." (An earlier version didn't specify the logo was for Tmall.)Alibaba…

Bitly, a URL-shortening service, has a pufferfish mascot named Chauncey McPufferson.
Bitly…

Cubie, a messaging app, uses an owl named Cubie for its logo. Originally the company considered using a more literal icon for Cubie but switched after its designer found inspiration in the Harry Potter book series, in which owls deliver messages.
Cubie…

The note-taking app Evernote's logo is an elephant.
Evernote…

Firefox is an open-source web browser developed by the Mozilla Foundation. The animal in the browser's logo is a fox; however, Firefox takes its name from the nickname for the red panda.
Mozilla…

GitHub, a code-management resource, has a mascot named Octocat.
GitHub…

Rivalfox, a firm that monitors businesses' competitors, has a fox logo named Rivaldofski. The firm chose the name because it included both "rival," which is in its name, and "dofksi" -- the funny and unique culture they hope to cultivate.
Rivalfox…

The anonymous social-messaging app Secret has a fox for its logo.
Secret…

Foursquare's check-in app Swarm has a bee logo.
Swarm…

TaskRabbit, an online marketplace for users to outsource small jobs, uses a rabbit named Hazel.
TaskRabbit…

Timehop, a "today in history" on social media app, has a dinosaur named Abe as its mascot.
Timehop…

The logo for travel website TripAdvisor is an owl named Ollie.
TripAdvisor…

TunnelBear, a VPN app, has a bear costume for the company intern to wear.
TunnelBear…

The logo for VKontakte, a social network that is popular in Russia and Europe, is a dog.
VKontakte…

The videogame maker Zynga was named in honor of founder Mark Pincus's American bulldog, Zinga.
Zynga…